Journal of Applied Physiology
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J Appl Physiol 84: 695-702, 1998;
8750-7587/98 $5.00
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Vol. 84, Issue 2, 695-702, February 1998

Arginine in burn injury improves cardiac performance and prevents bacterial translocation

Jureta W. Horton, Jean White, David Maass and Billy Sanders

Department of Surgery, The University of Texas Southwestern Medical Center, Dallas, Texas 75235-9160

Horton, Jureta W., Jean White, David Maass, and Billy Sanders. Arginine in burn injury improves cardiac performance and prevents bacterial translocation. J. Appl. Physiol. 84(2): 695-702, 1998.---This study examined the effects of arginine supplement of fluid resuscitation from burn injury on cardiac contractile performance and bacterial translocation after a third-degree burn comprising 43% of the total body surface area in adult rats. Before burn injury, rats were instrumented to measure blood pressure; after burn (or sham injury), paired groups of sham-burned and burned rats were given vehicle (saline), L-arginine, D-arginine, or N-methyl-L-arginine (300 mg/kg in 0.3 ml of saline 30 min, 6 h, and 23 h postburn) plus fluid resuscitation; sham-burned rats received drug only. Twenty-four hours after burn trauma, hemodynamics were measured; the animals were then killed and randomly assigned to Langendorff heart studies or to studies examining translocation of gut bacteria. Burn rats treated with vehicle, D-arginine, or N-methyl-L-arginine had well-defined cardiocirculatory responses that included hypotension, tachycardia, respiratory compensation for metabolic acidosis, hypocalcemia, cardiac contractile depression, and significant bacterial translocation. Compared with values measured in vehicle-treated burn rats, L-arginine given after burn improved blood pressure, prevented tachycardia, reduced serum lactate levels, improved cardiac performance, and significantly reduced bacterial translocation, confirming that L-arginine administration after burn injury provided significant cardiac and gastrointestinal protection. Circulating neutrophil counts fell after burn trauma and serum glucagon levels rose, but these changes were not altered by pharmacological intervention. Our finding of significantly higher coronary perfusate guanosine 3',5'-cyclic monophosphate concentration in L-arginine-treated burn rats suggests that the beneficial effects of L-arginine were mediated by nitric oxide production.

cardiac contractile function; rats; gastrointestinal integrity; arginine supplement to fluid resuscitation; cutaneous burn trauma

The Journal of Applied Physiology 84(2):695-702
8750-7587/98 $5.00 Copyright © 1998 the American Physiological Society


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